Update from December 11, 2020 at 11:40 p.m .:
The situation seems to have returned to normal, according to Xbox support. Hope that’s the case with you.
Players should be able to access Party Chat again without any problems. Thank you for your patience and have fun playing. https://t.co/kXqbTf0eyf
– Xbox support (@XboxSupport) December 11, 2020
Xbox Live appears to be having some operational issues tonight. In fact, as reported by the Xbox support Twitter account, it does impossible
Xbox technical teams are already in place to fix these errors and the inconveniences they cause. I hope all of this will be resolved as soon as possible. We will of course keep you informed as the situation develops.